{"gene":"CEP290","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2006,"finding":"CEP290 localizes to centrosomes of dividing cells and to the connecting cilium of retinal photoreceptors. In the rd16 mouse, an in-frame deletion in CEP290 causes early-onset retinal degeneration; the truncated CEP290 protein (ΔCep290) shows stronger association with specific RPGR isoform(s), and RPGR and phototransduction proteins are redistributed in rd16 photoreceptors, implicating CEP290 in ciliary transport and polarized protein distribution in photoreceptors.","method":"Genetic mapping, immunolocalization, co-immunoprecipitation, immunogold electron microscopy in rd16 mouse retina","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetic mapping, co-IP, immunogold EM) in a defined loss-of-function mouse model with specific phenotypic readout","pmids":["16632484"],"is_preprint":false},{"year":2010,"finding":"In Chlamydomonas, CEP290 is located in the flagellar transition zone and forms microtubule-membrane linkers that tether the flagellar membrane to transition zone microtubules; loss of CEP290 causes defects in these connectors and abnormal flagellar protein composition including altered levels of IFT proteins. CEP290 at the transition zone undergoes rapid turnover as shown by dikaryon experiments.","method":"Immunoelectron microscopy, ultrastructural analysis, biochemical fractionation of isolated flagella, dikaryon rescue experiments in Chlamydomonas cep290 deletion mutant","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution-level structural and biochemical analysis with multiple orthogonal methods in a clean genetic deletion mutant","pmids":["20819941"],"is_preprint":false},{"year":2008,"finding":"CEP290 interacts with the centriolar satellite protein PCM-1; CEP290 localizes to centriolar satellites in a PCM-1- and microtubule-dependent manner. Depletion of CEP290 disrupts PCM-1 distribution and complex formation, disorganizes the cytoplasmic microtubule network, impairs ciliogenesis, and prevents ciliary targeting of Rab8a.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, microtubule disruption assays in cultured cells","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, siRNA KD with multiple phenotypic readouts, single lab but orthogonal methods","pmids":["18772192"],"is_preprint":false},{"year":2008,"finding":"CP110 interacts with CEP290 in a discrete complex separable from other CP110 complexes. Interaction with CEP290 is required for CP110 to suppress primary cilia formation. Both CEP290 and CP110 interact with Rab8a; depletion of CEP290 prevents ciliogenesis and interferes with Rab8a localization to centrosomes and cilia.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying discrete complex, KD with rescue experiments, replicated across two proteins","pmids":["18694559"],"is_preprint":false},{"year":2007,"finding":"CEP290/NPHP6 is required for G protein (Golf and Gγ13) trafficking into olfactory sensory neuron cilia; in rd16 hypomorphic CEP290 mice, olfactory cilia remain intact but Golf and Gγ13 fail to localize to cilia while G protein-coupled odorant receptors and other odorant signaling pathway components are unaffected. CEP290 localizes to dendritic knobs of OSNs in complex with ciliary transport proteins and olfactory G proteins.","method":"Electro-olfactogram recordings, immunofluorescence, co-immunoprecipitation in rd16 mouse olfactory tissue","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP, functional electrophysiology, selective localization phenotype with specific positive and negative controls","pmids":["17898177"],"is_preprint":false},{"year":2008,"finding":"CC2D2A physically interacts with CEP290 at the basal body (shown by yeast two-hybrid and GST pull-down), co-localizes with CEP290 in ciliated cells, and genetically interacts with CEP290 in zebrafish: combined subminimal knockdown of CC2D2A and cep290 produces synergistic pronephric cyst phenotype.","method":"Yeast two-hybrid, GST pull-down, immunofluorescence co-localization, zebrafish morpholino epistasis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro binding (GST pull-down + Y2H) plus in vivo genetic epistasis in zebrafish","pmids":["18950740"],"is_preprint":false},{"year":2012,"finding":"CEP290 localizes to the transition zone at the Y-linker region between central microtubules and plasma membrane in photoreceptor connecting cilia and other ciliated cells. Complete knockout (Cep290ko/ko) mice lack connecting cilia in retinal photoreceptors and fail to mature ciliated ventricular ependyma, demonstrating CEP290 is required for connecting cilia biogenesis.","method":"Immunofluorescence, electron microscopy, genetic KO mouse models (Cep290ko/ko and Cep290gt/gt)","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — precise ultrastructural localization combined with KO mouse phenotype; replicated across multiple mouse alleles","pmids":["25859007"],"is_preprint":false},{"year":2013,"finding":"CEP290 directly binds cellular membranes through an N-terminal amphipathic helix domain and to microtubules through a domain within its myosin-tail homology region. CEP290 activity is regulated by two autoinhibitory domains at the N and C termini. Disruption of the microtubule-binding domain in a mouse model is sufficient to cause cilia formation deficits and retinal degeneration.","method":"Domain mapping, in vitro binding assays (membrane and microtubule co-sedimentation), mutagenesis, in vivo mouse model analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of binding, domain mutagenesis, and in vivo functional validation in mouse","pmids":["24051377"],"is_preprint":false},{"year":2013,"finding":"BBSome physically interacts with CEP290 via BBS4 binding to the N-terminal region of CEP290. BBSome co-localizes with CEP290 at the transition zone, centriolar satellites, and connecting cilium. In BBSome-depleted cells, CEP290 still localizes to TZ and connecting cilium but its centriolar satellite localization is disrupted. Genetic interaction: additional loss of Bbs4 alleles in Cep290rd16 mice accelerates photoreceptor degeneration and increases body weight.","method":"Co-immunoprecipitation, immunofluorescence, siRNA depletion, Cep290rd16/Bbs4-null double-mutant mouse epistasis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP identifying specific binding domain, multiple depletion phenotypes, in vivo epistasis in mouse","pmids":["23943788"],"is_preprint":false},{"year":2012,"finding":"Cep290 and Cep72 interact with PCM-1 at centriolar satellites. Cep72 is required for recruitment of Cep290 to centriolar satellites. Loss of PCM-1 satellites relocalizes Cep72 and Cep290 to the centrosome. Depletion of Cep290 or Cep72, but not loss of centriolar satellites, impairs ciliary recruitment of the BBSome subunit BBS8 during ciliogenesis, defining a Cep72-Cep290 pathway for BBSome ciliary targeting.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, zebrafish morpholino knockdown","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, selective siRNA phenotypes with hierarchy analysis, in vivo zebrafish confirmation","pmids":["22767577"],"is_preprint":false},{"year":2008,"finding":"The N-terminal domain of nephrocystin-6 (CEP290/NPHP6) directly binds nephrocystin-5 (NPHP5); the interacting region maps to amino acids 696-896 of NPHP6. Combined knockdown of zNPHP5 and zNPHP6 in zebrafish produces synergistic phenotypes. Expression of the NPHP5-binding fragment of NPHP6 in Xenopus phenocopies NPHP5 knockdown neural tube closure defects, which are rescued by co-expression of NPHP5.","method":"Pull-down interaction mapping, zebrafish morpholino co-knockdown epistasis, Xenopus overexpression/rescue experiments","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro domain mapping plus two-organism in vivo genetic epistasis with rescue","pmids":["18723859"],"is_preprint":false},{"year":2012,"finding":"The domain deleted in the Cep290rd16 mutant protein directly interacts with the ciliopathy protein MKKS; BBS mutations in patients disrupt this interaction. Combined subminimal knockdown of mkks and cep290 in zebrafish causes sensory defects. Paradoxically, combinations of Cep290rd16 and Mkksko alleles in mice improve ciliogenesis and sensory functions compared to either single mutant, suggesting that altered Cep290-MKKS association affects multiprotein complex integrity at the transition zone/basal body.","method":"In vitro interaction assay, zebrafish morpholino epistasis, Cep290rd16/Mkksko compound mouse mutant analysis, ciliogenesis assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein interaction, zebrafish epistasis, and mouse genetic interaction with functional rescue phenotype","pmids":["22446187"],"is_preprint":false},{"year":2014,"finding":"NPHP5 contains two separate BBS-binding sites and interacts with the BBSome to mediate its integrity. Depletion of Cep290, which directly binds NPHP5, causes additional dissociation of BBS8 from the BBSome and loss of ciliary BBS8 beyond the BBS2/BBS5 loss seen with NPHP5 depletion alone. Delivery of BBSome cargos (smoothened, VPAC2, Rab8a) to cilia is selectively impaired in the absence of NPHP5 or Cep290.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliary cargo trafficking assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP defining distinct binding sites, selective BBSome dissociation phenotypes, functional cargo trafficking readout","pmids":["25552655"],"is_preprint":false},{"year":2013,"finding":"NPHP5 interaction with Cep290 is required for NPHP5 function in ciliogenesis: disease-causing NPHP5 truncation mutations cannot bind Cep290 and fail to localize to centrosomes, thereby preventing cilia formation. Drugs antagonizing negative regulators of ciliogenesis rescue cilia in NPHP5-depleted cells with response profiles matching Cep290-depleted cells, further linking the two proteins to a common ciliogenic pathway.","method":"Co-immunoprecipitation, mutagenesis of patient alleles, immunofluorescence, pharmacological rescue","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — disease-mutation co-IP/localization, functional ciliogenesis rescue, mechanistic pathway placement","pmids":["23446637"],"is_preprint":false},{"year":2016,"finding":"In C. elegans, CEP-290 (Cep290 ortholog) is a central MKS module assembly factor that depends on the coiled-coil region of MKS-5 (Rpgrip1L) for TZ localization. CEP-290 prevents inappropriate membrane-associated protein entry into cilia and keeps ARL-13 from leaking out through the TZ gate, defining CEP290 as essential for ciliary gating function. Multiple TZ proteins including TMEM-138 and CDKL-1 require CEP-290 for TZ localization.","method":"C. elegans genetics, GFP reporter ciliary entry/exit assays, epistasis of module localization hierarchy","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo C. elegans genetic hierarchy with functional ciliary gate assay and multiple protein localization readouts","pmids":["26982032"],"is_preprint":false},{"year":2020,"finding":"In Drosophila, the N-terminus of CEP290 directly recruits DZIP1 to the transition zone; DZIP1 then recruits Chibby (CBY) and Rab8 to promote early ciliary membrane formation. Complete CEP290 deletion blocks ciliogenesis at the TZ assembly initiation stage, which is phenocopied by DZIP1 mutants lacking the CEP290-binding domain. Expression of the CEP290 N-terminus alone is sufficient to restore DZIP1 TZ localization and ameliorate TZ assembly defects.","method":"Drosophila genetics, in vitro pull-down, immunofluorescence, domain rescue experiments","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro direct binding, domain-specific rescue in vivo, mechanistic pathway ordering (CEP290→DZIP1→CBY/Rab8)","pmids":["33370260"],"is_preprint":false},{"year":2015,"finding":"CEP290 loss results in enhanced DNA damage signaling and accumulation of DNA breaks in primary kidney cells and zebrafish embryos. Cep290-deficient cells exhibit supernumerary centrioles, decreased replication fork velocity, fork asymmetry, and increased CDK levels. CDK inhibition rescues both DNA damage and centriole number in Cep290-deficient cells and restores primary cilia loss in 3D kidney cell spheroids.","method":"DNA fiber assay (replication fork analysis), γH2AX immunofluorescence, centriole counting, CDK inhibitor rescue, primary murine kidney cells and zebrafish morpholino","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (fiber assay, γH2AX, CDK rescue) in single lab; nuclear function of CEP290 less independently replicated","pmids":["26301811"],"is_preprint":false},{"year":2004,"finding":"CEP290 (3H11Ag) localizes to both cytoplasm and nucleus; nuclear CEP290 associates with DNA and the nuclear matrix. The C-terminal 150 amino acid residues are responsible for this subcellular localization.","method":"Fluorescent protein fusion expression in COS-7 cells, subcellular fractionation, sequential nuclear extraction, truncation mapping","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by live imaging and fractionation with domain mapping; single lab, single study","pmids":["15474516"],"is_preprint":false},{"year":2011,"finding":"CEP290-mediated photoreceptor degeneration is associated with aberrant accumulation of the novel CEP290 interacting partner RKIP (Raf-1 kinase inhibitory protein) in rd16 retina. Ectopic RKIP accumulation causes defective cilia formation, an effect mediated by RKIP interaction with the ciliary GTPase Rab8A. This phenotype is reproduced by cep290 morpholino knockdown in zebrafish.","method":"Co-immunoprecipitation (CEP290-RKIP interaction), immunofluorescence in rd16 mouse retina, zebrafish morpholino knockdown, ciliogenesis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of novel interacting partner, functional cilia assay, zebrafish in vivo validation; single lab","pmids":["21685394"],"is_preprint":false},{"year":2016,"finding":"Physical interaction between RPGR and the C-terminal domain of CEP290 was demonstrated. Genetically, Rpgrko/Y mice with a heterozygous hypomorphic Cep290rd16 allele (but not a null or other ciliopathy gene heterozygotes) develop early-onset retinal degeneration with disorganized outer segments and defective opsin trafficking, establishing Cep290 as a modifier of RPGR-associated retinal degeneration.","method":"Co-immunoprecipitation (RPGR–CEP290 C-terminal domain), mouse genetic epistasis (Rpgrko/Cep290rd16 compound mutants), immunofluorescence","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and in vivo genetic interaction, but specificity to the rd16 hypomorphic allele only noted in a single lab","pmids":["26936822"],"is_preprint":false},{"year":2013,"finding":"SSX2IP localizes to the basal body and is required for efficient recruitment of Cep290 to centriolar satellites and the basal body. Loss of SSX2IP reduces BBSome ciliary entry and Rab8 accumulation at cilia, and decreases ciliary targeting of the membrane protein somatostatin receptor 3, placing SSX2IP upstream of Cep290 in satellite-mediated ciliary trafficking.","method":"siRNA knockdown, immunofluorescence, ciliary trafficking assays for membrane cargo","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, knockdown phenotype with multiple cargo readouts but no direct binding assay reported","pmids":["24356449"],"is_preprint":false},{"year":2017,"finding":"In JSRD fibroblasts lacking CEP290, ciliogenesis is abnormal and localization of ADCY3 and ARL13B in cilia is selectively reduced. Hedgehog signaling is augmented in CEP290-JSRD cells due to enhanced ciliary transport of Smoothened and GPR161, establishing CEP290 as a selective gatekeeper for transport of Hedgehog signaling molecules.","method":"Patient-derived fibroblasts and iPSC-optic cups, immunofluorescence, Hedgehog pathway reporter assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cell types and pathway readouts, patient-derived material, single lab","pmids":["28700940"],"is_preprint":false},{"year":2021,"finding":"RPGRIP1L governs ciliary gating by ensuring the proper amount of Cep290 at the vertebrate transition zone; loss of Rpgrip1l reduces Cep290 at the TZ and impairs gating. The flavonoid eupatilin rescues ciliary gating defects caused by Rpgrip1l loss.","method":"Mouse genetics (Rpgrip1l mutants), immunofluorescence quantification of Cep290 at TZ, ciliary gating reporter assays, pharmacological rescue","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic model with TZ protein quantification and functional gating assay; single lab","pmids":["33625872"],"is_preprint":false},{"year":2022,"finding":"CP110, CEP97, and CEP290 together seed the initial phosphorylated HSP27 ring at the centrosome required for aggresome assembly. Centriolar satellites are required for subsequent aggresome growth from this ring. CP110-CEP97-CEP290 are also required for aggregation of mutant huntingtin protein.","method":"siRNA/CRISPR knockdown, high-resolution microscopy (aggresome assembly assays), phospho-HSP27 immunofluorescence","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — structured quantitative imaging with KD of multiple pathway components; single lab but multiple orthogonal readouts","pmids":["35411088"],"is_preprint":false},{"year":2018,"finding":"A CEP290 missense variant (R1747Q/R1746Q) disrupts the ciliary diffusion barrier, causes mislocalization of the Hedgehog receptor Smoothened, and impairs Sonic Hedgehog signaling response in cerebellar granule progenitors, leading to proliferation defects. This was confirmed in an autism patient-derived iPSC line.","method":"FRAP (ciliary protein mobility), immunofluorescence (Smo localization), Shh signaling assay, patient iPSC-derived cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP for diffusion barrier, functional Shh assay, validated in patient iPSC; single lab","pmids":["30478281"],"is_preprint":false},{"year":2017,"finding":"CCDC66 is a centriolar satellite protein that co-immunoprecipitates with both CEP290 and PCM1. Depletion of CCDC66 impairs ciliogenesis, ciliary BBS4 recruitment, and centriolar satellite organization.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP plus KD phenotype with multiple readouts; single lab","pmids":["28235840"],"is_preprint":false},{"year":2021,"finding":"Super-resolution microscopy localizes CEP290 radially between the microtubule doublets and the ciliary membrane throughout the full length of the connecting cilium in photoreceptors, with nine-fold symmetry. In contrast, in RPE-1 cells CEP290 is confined to the very base of primary cilia. Severe CEP290 deficiency does not prevent earliest cilia assembly but results in fewer cilia, no normal outer segments, and abnormal connecting cilium membrane; Y-shaped links are still present in CEP290-deficient photoreceptors.","method":"Super-resolution fluorescence microscopy (STORM/STED), electron microscopy, multiple Cep290 mutant mouse models","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1 / Strong — sub-diffraction resolution structural localization with multiple mutant models and EM validation","pmids":["34520396"],"is_preprint":false},{"year":2025,"finding":"CEP290 is distributed throughout the connecting cilium between microtubules and membrane with nine-fold symmetry. In CEP290-deficient mouse photoreceptors, the connecting cilium membrane is aberrant, the ciliary necklace and Y-links are confined to the proximal connecting cilium, and TZ proteins AHI1 and NPHP1 are abnormally restricted to the proximal CC while NPHP8 and CEP89 are unaffected. Outer segment disc formation is inhibited and large numbers of extracellular vesicles accumulate.","method":"Electron microscopy, immunofluorescence, advanced microscopy in Cep290 conditional KO mouse photoreceptors during development","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — EM ultrastructure plus selective protein localization analysis in KO; single lab, rigorous controls","pmids":["40704549"],"is_preprint":false},{"year":2024,"finding":"The Cep131-Cep162 module (near the axoneme) and the Cby-Fam92 module (close to the membrane) synergistically control the basal body localization of Cep290 and initiation of ciliogenesis in Drosophila. Concurrent deletion of any protein from both modules causes complete loss of Cep290 from the basal body and blocks ciliogenesis at its initiation stage, demonstrating cooperative retroactive interactions converging on Cep290.","method":"Drosophila genetics (single and double deletion mutants), immunofluorescence, ciliogenesis initiation assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean genetic epistasis with double-deletion confirmation and mechanistic pathway ordering; single lab but multiple allele combinations","pmids":["38442096"],"is_preprint":false},{"year":2021,"finding":"In zebrafish cep290 genetic mutants (but not morpholino knockdowns), cilia-associated small GTPases arl3, arl13b, and unc119b are upregulated; ectopic expression of these genes rescues Kupffer's vesicle cilia and partially rescues photoreceptor outer segment defects in cep290 morphants. UNC119b upregulation was also observed in human Joubert syndrome CEP290 patient-derived renal epithelial cells, identifying lipidated protein trafficking to cilia as a compensatory pathway.","method":"Zebrafish CRISPR/morpholino, RNA-seq, ectopic overexpression rescue, human patient-derived cells","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo functional rescue with three GTPases, confirmed in human patient cells; single lab","pmids":["34155518"],"is_preprint":false},{"year":2011,"finding":"Expression of only the N-terminal region of human CEP290 rescues the vision impairment caused by cep290 disruption in zebrafish, demonstrating that the N-terminal domain is sufficient to restore visual function and represents a minimal functional unit.","method":"Zebrafish morpholino knockdown, domain-specific rescue with human CEP290 fragments, visual function assay (optokinetic response)","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain rescue in vivo with functional visual readout; single lab","pmids":["21257638"],"is_preprint":false},{"year":2018,"finding":"CEP290 C-terminal domain (989 residues including the region deleted in rd16 mice) delivered by AAV complements the Cep290rd16 mutation in trans, reconstitutes CEP290 function, preserves cone photoreceptors, and delays rod death in Cep290rd16 mice and rd16;Nrl-/- mice; the same fragment also improves cilia phenotypes in mouse embryonic fibroblasts and iPSC-derived retinal organoids.","method":"AAV-mediated domain delivery, photoreceptor cell counting, ERG, cilia phenotype rescue in fibroblasts and iPSC organoids","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo functional rescue in two mouse models plus in vitro orthogonal validation; establishes C-terminal domain sufficiency","pmids":["30332642"],"is_preprint":false}],"current_model":"CEP290 is a large multi-domain protein that localizes to the ciliary transition zone (specifically between the microtubule doublets and the membrane at Y-linker structures) and to centriolar satellites, where it acts as an essential structural and regulatory gatekeeper: its N-terminal membrane-binding amphipathic helix and microtubule-binding myosin-tail homology domain form the physical linkers tethering the ciliary membrane to TZ microtubules, while autoinhibitory N- and C-terminal domains regulate its activity; at the base of cilia CEP290 controls selective protein entry and exit (ciliary gating), interacts with RPGR, PCM-1, NPHP5, CC2D2A, MKKS, and the BBSome (via BBS4) to coordinate ciliary targeting of Rab8a and BBSome cargoes, and in photoreceptors is specifically required for connecting cilium maturation, correct spatial distribution of a subset of TZ proteins (AHI1, NPHP1), and outer segment disc formation."},"narrative":{"mechanistic_narrative":"CEP290 is a large multi-domain ciliary protein that functions as a structural tether and selective gatekeeper at the transition zone (TZ) connecting the ciliary membrane to axonemal microtubules, controlling protein entry and exit from the cilium [PMID:20819941, PMID:26982032]. It directly binds membranes through an N-terminal amphipathic helix and microtubules through a domain in its myosin-tail homology region, with two autoinhibitory domains at the N and C termini regulating its activity; disruption of the microtubule-binding domain alone causes cilia deficits and retinal degeneration [PMID:24051377]. In Chlamydomonas and vertebrate photoreceptors CEP290 forms the microtubule–membrane Y-linkers, localizing with nine-fold symmetry between the doublets and membrane along the connecting cilium [PMID:20819941, PMID:34520396]. As a gating factor it prevents inappropriate entry of membrane-associated proteins and restrains leakage of ciliary proteins such as ARL13B through the TZ [PMID:26982032], and selectively controls trafficking of signaling cargoes including Hedgehog components (Smoothened, GPR161) and G proteins, with loss augmenting Hedgehog signaling [PMID:28700940, PMID:30478281, PMID:17898177]. CEP290 also localizes to centriolar satellites in a PCM-1- and microtubule-dependent manner, where it organizes BBSome ciliary targeting and Rab8a delivery [PMID:18772192, PMID:18694559, PMID:22767577]. It binds a network of ciliopathy proteins — NPHP5, CC2D2A, MKKS, RPGR, and the BBSome via BBS4 — to assemble and maintain TZ/satellite multiprotein complexes [PMID:18950740, PMID:23943788, PMID:18723859, PMID:22446187, PMID:26936822]. CEP290 TZ localization is governed hierarchically by RPGRIP1L/MKS-5 and by cooperating basal-body modules [PMID:26982032, PMID:33625872, PMID:38442096], and the protein is specifically required for connecting cilium biogenesis, photoreceptor outer segment disc formation, and correct spatial distribution of TZ proteins AHI1 and NPHP1 [PMID:25859007, PMID:40704549]. Mutations in CEP290 cause early-onset retinal degeneration, and both N-terminal and C-terminal fragments retain sufficient function to rescue ciliary and visual defects in vivo [PMID:16632484, PMID:21257638, PMID:30332642].","teleology":[{"year":2004,"claim":"Established the basic subcellular distribution of CEP290 before its ciliary role was known, identifying a C-terminal determinant for nuclear/DNA-matrix association.","evidence":"Fluorescent fusion expression, subcellular fractionation, and truncation mapping in COS-7 cells","pmids":["15474516"],"confidence":"Medium","gaps":["Functional consequence of nuclear localization not defined","Relationship between nuclear pool and ciliary pool unresolved"]},{"year":2006,"claim":"Linked CEP290 to photoreceptor ciliary transport in vivo, showing that an in-frame deletion causes retinal degeneration and redistribution of RPGR and phototransduction proteins.","evidence":"Genetic mapping, co-IP, and immunogold EM in rd16 mouse retina","pmids":["16632484"],"confidence":"High","gaps":["Direct molecular basis of protein mislocalization not defined","Domain mediating RPGR association not mapped"]},{"year":2008,"claim":"Defined CEP290 as a centriolar satellite component and a hub of ciliopathy-protein interactions (PCM-1, CP110, CC2D2A, NPHP5) controlling ciliogenesis and Rab8a targeting.","evidence":"Co-IP, Y2H/GST pull-down, siRNA, and zebrafish/Xenopus epistasis across multiple studies","pmids":["18772192","18694559","18950740","18723859"],"confidence":"High","gaps":["Order of complex assembly not resolved","Whether interactions are direct vs. complex-mediated varies by partner"]},{"year":2010,"claim":"Resolved CEP290's structural function, showing it forms the microtubule–membrane linkers tethering the flagellar membrane to TZ microtubules and influences ciliary protein composition.","evidence":"Immuno-EM, biochemical fractionation, and dikaryon rescue in Chlamydomonas cep290 deletion mutant","pmids":["20819941"],"confidence":"High","gaps":["Molecular identity of the linker components beyond CEP290 unresolved","Direct vs. indirect contribution to IFT protein levels unclear"]},{"year":2011,"claim":"Demonstrated functional modularity, with the N-terminal region sufficient to restore vision and identifying RKIP as a partner whose accumulation impairs ciliogenesis via Rab8A.","evidence":"Zebrafish domain-rescue with human fragments and co-IP/immunofluorescence in rd16 retina","pmids":["21257638","21685394"],"confidence":"Medium","gaps":["RKIP interaction confirmed in a single lab","How N-terminal sufficiency relates to full-length gating function unclear"]},{"year":2012,"claim":"Placed CEP290 within satellite trafficking hierarchies (Cep72-dependent recruitment) and defined direct partners (MKKS) whose disrupted association alters TZ complex integrity.","evidence":"Co-IP, siRNA hierarchy, in vitro interaction, and zebrafish/mouse compound-mutant epistasis","pmids":["22767577","22446187"],"confidence":"High","gaps":["Paradoxical genetic rescue (rd16/Mkks) mechanism unresolved","Stoichiometry of TZ multiprotein complexes not defined"]},{"year":2013,"claim":"Mapped CEP290's biochemical activities — membrane and microtubule binding plus autoinhibition — and established interdependence with NPHP5 and BBSome (via BBS4) for ciliogenesis.","evidence":"Domain mapping, in vitro co-sedimentation, mutagenesis, mouse models, co-IP, and mouse epistasis","pmids":["24051377","23446637","23943788"],"confidence":"High","gaps":["Structural basis of autoinhibition not solved","Trigger relieving autoinhibition in vivo unknown"]},{"year":2014,"claim":"Showed CEP290 acts through NPHP5 to maintain BBSome integrity and selective ciliary cargo delivery (Smoothened, VPAC2, Rab8a).","evidence":"Co-IP defining distinct BBS-binding sites, siRNA, and ciliary cargo trafficking assays","pmids":["25552655"],"confidence":"High","gaps":["Mechanism by which CEP290 stabilizes BBSome subunit association unclear","Direct vs. indirect cargo selectivity not separated"]},{"year":2016,"claim":"Defined CEP290's role in the in vivo ciliary gate (preventing aberrant entry, retaining ARL-13) and revealed a nuclear/genome-stability function linked to replication and centriole number.","evidence":"C. elegans GFP gating assays and DNA fiber/γH2AX/CDK-rescue in primary kidney cells and zebrafish","pmids":["26982032","26301811"],"confidence":"Medium","gaps":["Nuclear/DNA-damage function less independently replicated","Mechanistic link between ciliary and replication phenotypes unresolved"]},{"year":2017,"claim":"Established CEP290 as a selective gatekeeper for Hedgehog signaling cargo and identified additional satellite partners and an aggresome-seeding role.","evidence":"Patient fibroblasts/iPSC-optic cups with Hedgehog reporters, co-IP, and aggresome assembly assays","pmids":["28700940","28235840","35411088"],"confidence":"Medium","gaps":["Direct CCDC66 binding interface not mapped","Generality of aggresome role beyond tested cargoes unknown"]},{"year":2018,"claim":"Connected a specific CEP290 missense variant to a defective ciliary diffusion barrier and Hedgehog/RPGR-dependent disease modification, and demonstrated C-terminal domain sufficiency for therapeutic rescue.","evidence":"FRAP and Shh assays in patient iPSC, RPGR co-IP/mouse epistasis, and AAV C-terminal complementation in rd16 mice and organoids","pmids":["30478281","26936822","30332642"],"confidence":"Medium","gaps":["Allele-specific (rd16) nature of RPGR modification limits generalization","How a single missense disrupts the barrier mechanistically unresolved"]},{"year":2021,"claim":"Provided sub-diffraction structural localization across cell types and defined upstream regulators (RPGRIP1L) and compensatory GTPase trafficking pathways.","evidence":"STORM/STED and EM in mouse photoreceptors and RPE-1, mouse Rpgrip1l genetics, and zebrafish RNA-seq/rescue with arl3/arl13b/unc119b","pmids":["34520396","33625872","34155518"],"confidence":"Medium","gaps":["Why Y-links persist in CEP290-deficient photoreceptors unresolved","Mechanism of eupatilin/compensatory rescue unknown"]},{"year":2024,"claim":"Mapped the cooperative basal-body module network that recruits CEP290 to initiate ciliogenesis.","evidence":"Drosophila single and double deletion genetics with ciliogenesis-initiation assays","pmids":["38442096"],"confidence":"High","gaps":["Biochemical nature of module-CEP290 contacts not defined","Conservation of the dual-module logic in vertebrates untested here"]},{"year":2025,"claim":"Defined CEP290's role in spatial organization of the connecting cilium, showing selective confinement of AHI1/NPHP1 and failure of outer segment disc formation upon loss.","evidence":"EM and selective protein localization in Cep290 conditional KO mouse photoreceptors during development","pmids":["40704549"],"confidence":"High","gaps":["Mechanism restricting AHI1/NPHP1 distribution unresolved","Origin of accumulating extracellular vesicles unclear"]},{"year":null,"claim":"How CEP290's autoinhibition is relieved and how it achieves cargo-selective gating at the molecular level remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of CEP290 or its TZ linker assembly","Mechanism distinguishing permitted vs. blocked cargo undefined","Functional significance of nuclear CEP290 pool unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[7,1]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[7]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,26]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,9,12]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[1,6,26,27]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,2,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1,6,28]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[2,3,12]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[21,24]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,31]}],"complexes":["ciliary transition zone (MKS module)","centriolar satellites","CP110-CEP97-CEP290 complex"],"partners":["PCM1","NPHP5","CC2D2A","MKKS","RPGR","BBS4","CP110","RPGRIP1L"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O15078","full_name":"Centrosomal protein of 290 kDa","aliases":["Bardet-Biedl syndrome 14 protein","Cancer/testis antigen 87","CT87","Nephrocystin-6","Tumor antigen se2-2"],"length_aa":2479,"mass_kda":290.4,"function":"Involved in early and late steps in cilia formation. Its association with CCP110 is required for inhibition of primary cilia formation by CCP110 (PubMed:18694559). May play a role in early ciliogenesis in the disappearance of centriolar satellites and in the transition of primary ciliar vesicles (PCVs) to capped ciliary vesicles (CCVs). Required for the centrosomal recruitment of RAB8A and for the targeting of centriole satellite proteins to centrosomes such as of PCM1 (PubMed:24421332). Required for the correct localization of ciliary and phototransduction proteins in retinal photoreceptor cells; may play a role in ciliary transport processes (By similarity). Required for efficient recruitment of RAB8A to primary cilium (PubMed:17705300). In the ciliary transition zone is part of the tectonic-like complex which is required for tissue-specific ciliogenesis and may regulate ciliary membrane composition (By similarity). Involved in regulation of the BBSome complex integrity, specifically for presence of BBS2, BBS5 and BBS8/TTC8 in the complex, and in ciliary targeting of selected BBSome cargos. May play a role in controlling entry of the BBSome complex to cilia possibly implicating IQCB1/NPHP5 (PubMed:25552655). Activates ATF4-mediated transcription (PubMed:16682973)","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriolar satellite; Nucleus; Cell projection, cilium; Cytoplasm, cytoskeleton, cilium basal body; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole; Cytoplasmic vesicle","url":"https://www.uniprot.org/uniprotkb/O15078/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CEP290","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CEP290","total_profiled":1310},"omim":[{"mim_id":"620248","title":"TRANSMEMBRANE PROTEIN 80; TMEM80","url":"https://www.omim.org/entry/620248"},{"mim_id":"619988","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 77; MRT77","url":"https://www.omim.org/entry/619988"},{"mim_id":"619287","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 66; CCDC66","url":"https://www.omim.org/entry/619287"},{"mim_id":"619285","title":"TRANSMEMBRANE PROTEIN 218; TMEM218","url":"https://www.omim.org/entry/619285"},{"mim_id":"619111","title":"COACH SYNDROME 2; COACH2","url":"https://www.omim.org/entry/619111"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Centrosome","reliability":"Approved"},{"location":"Basal body","reliability":"Approved"},{"location":"Mid piece","reliability":"Approved"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CEP290"},"hgnc":{"alias_symbol":["KIAA0373","FLJ13615","3H11Ag","rd16","NPHP6","JBTS5","SLSN6","LCA10","MKS4","BBS14","CT87","POC3"],"prev_symbol":[]},"alphafold":{"accession":"O15078","domains":[{"cath_id":"-","chopping":"212-341_353-389","consensus_level":"medium","plddt":70.1602,"start":212,"end":389},{"cath_id":"1.10.287,1.10.287","chopping":"1205-1339","consensus_level":"medium","plddt":70.9493,"start":1205,"end":1339},{"cath_id":"1.20.5","chopping":"871-954","consensus_level":"medium","plddt":71.6533,"start":871,"end":954}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O15078","model_url":"https://alphafold.ebi.ac.uk/files/AF-O15078-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O15078-F1-predicted_aligned_error_v6.png","plddt_mean":60.53},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CEP290","jax_strain_url":"https://www.jax.org/strain/search?query=CEP290"},"sequence":{"accession":"O15078","fasta_url":"https://rest.uniprot.org/uniprotkb/O15078.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O15078/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O15078"}},"corpus_meta":[{"pmid":"16909394","id":"PMC_16909394","title":"Mutations 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Genes with Ciliary Functions Cause Intellectual Disability in Multiple Families.","date":"2021","source":"Archives of Iranian medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34196201","citation_count":6,"is_preprint":false},{"pmid":"38881603","id":"PMC_38881603","title":"Twelve-month Natural History Study of Centrosomal Protein 290 (CEP290)-associated Inherited Retinal Degeneration.","date":"2024","source":"Ophthalmology science","url":"https://pubmed.ncbi.nlm.nih.gov/38881603","citation_count":6,"is_preprint":false},{"pmid":"30930621","id":"PMC_30930621","title":"The ciliopathy gene product Cep290 is required for primary cilium formation and microtubule network organization.","date":"2018","source":"Turkish journal of biology = Turk biyoloji dergisi","url":"https://pubmed.ncbi.nlm.nih.gov/30930621","citation_count":6,"is_preprint":false},{"pmid":"34196655","id":"PMC_34196655","title":"Spectrum of Disease Severity in Nonsyndromic Patients With Mutations in the CEP290 Gene: A Multicentric Longitudinal Study.","date":"2021","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/34196655","citation_count":6,"is_preprint":false},{"pmid":"26165328","id":"PMC_26165328","title":"Leber congenital amaurosis: first genotyped Hungarian patients and report of 2 novel mutations in the CRB1 and CEP290 genes.","date":"2015","source":"European journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/26165328","citation_count":6,"is_preprint":false},{"pmid":"28690834","id":"PMC_28690834","title":"From disease modelling to personalised therapy in patients with CEP290 mutations.","date":"2017","source":"F1000Research","url":"https://pubmed.ncbi.nlm.nih.gov/28690834","citation_count":6,"is_preprint":false},{"pmid":"40704549","id":"PMC_40704549","title":"Sub-ciliary localization of CEP290 and effects of its loss in mouse photoreceptors during development.","date":"2025","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/40704549","citation_count":5,"is_preprint":false},{"pmid":"36495011","id":"PMC_36495011","title":"Alternative splicing in CEP290 mutant cats results in a milder phenotype than LCACEP290 patients.","date":"2022","source":"Veterinary ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/36495011","citation_count":5,"is_preprint":false},{"pmid":"32600475","id":"PMC_32600475","title":"Novel biallelic loss-of-function variants in CEP290 cause Joubert syndrome in two siblings.","date":"2020","source":"Human genomics","url":"https://pubmed.ncbi.nlm.nih.gov/32600475","citation_count":5,"is_preprint":false},{"pmid":"32208788","id":"PMC_32208788","title":"Investigation of CEP290 genotype-phenotype correlations in a patient with retinitis pigmentosa, infertility, end-stage renal disease, and a novel mutation.","date":"2020","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32208788","citation_count":5,"is_preprint":false},{"pmid":"39213781","id":"PMC_39213781","title":"Spectrum and frequencies of extraocular features reported in CEP290-associated ciliopathy - A systematic review.","date":"2024","source":"Journal francais d'ophtalmologie","url":"https://pubmed.ncbi.nlm.nih.gov/39213781","citation_count":4,"is_preprint":false},{"pmid":"37293546","id":"PMC_37293546","title":"Comparative analysis of transcriptional changes in zebrafish cep290 and bbs2 mutants by RNA-seq reveals upregulation of inflammatory and stress-related pathways.","date":"2023","source":"Frontiers in molecular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/37293546","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49404,"output_tokens":8234,"usd":0.135861,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17989,"output_tokens":4774,"usd":0.104648,"stage2_stop_reason":"end_turn"},"total_usd":0.240509,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"CEP290 localizes to centrosomes of dividing cells and to the connecting cilium of retinal photoreceptors. In the rd16 mouse, an in-frame deletion in CEP290 causes early-onset retinal degeneration; the truncated CEP290 protein (ΔCep290) shows stronger association with specific RPGR isoform(s), and RPGR and phototransduction proteins are redistributed in rd16 photoreceptors, implicating CEP290 in ciliary transport and polarized protein distribution in photoreceptors.\",\n      \"method\": \"Genetic mapping, immunolocalization, co-immunoprecipitation, immunogold electron microscopy in rd16 mouse retina\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetic mapping, co-IP, immunogold EM) in a defined loss-of-function mouse model with specific phenotypic readout\",\n      \"pmids\": [\"16632484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In Chlamydomonas, CEP290 is located in the flagellar transition zone and forms microtubule-membrane linkers that tether the flagellar membrane to transition zone microtubules; loss of CEP290 causes defects in these connectors and abnormal flagellar protein composition including altered levels of IFT proteins. CEP290 at the transition zone undergoes rapid turnover as shown by dikaryon experiments.\",\n      \"method\": \"Immunoelectron microscopy, ultrastructural analysis, biochemical fractionation of isolated flagella, dikaryon rescue experiments in Chlamydomonas cep290 deletion mutant\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution-level structural and biochemical analysis with multiple orthogonal methods in a clean genetic deletion mutant\",\n      \"pmids\": [\"20819941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CEP290 interacts with the centriolar satellite protein PCM-1; CEP290 localizes to centriolar satellites in a PCM-1- and microtubule-dependent manner. Depletion of CEP290 disrupts PCM-1 distribution and complex formation, disorganizes the cytoplasmic microtubule network, impairs ciliogenesis, and prevents ciliary targeting of Rab8a.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, microtubule disruption assays in cultured cells\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, siRNA KD with multiple phenotypic readouts, single lab but orthogonal methods\",\n      \"pmids\": [\"18772192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CP110 interacts with CEP290 in a discrete complex separable from other CP110 complexes. Interaction with CEP290 is required for CP110 to suppress primary cilia formation. Both CEP290 and CP110 interact with Rab8a; depletion of CEP290 prevents ciliogenesis and interferes with Rab8a localization to centrosomes and cilia.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying discrete complex, KD with rescue experiments, replicated across two proteins\",\n      \"pmids\": [\"18694559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CEP290/NPHP6 is required for G protein (Golf and Gγ13) trafficking into olfactory sensory neuron cilia; in rd16 hypomorphic CEP290 mice, olfactory cilia remain intact but Golf and Gγ13 fail to localize to cilia while G protein-coupled odorant receptors and other odorant signaling pathway components are unaffected. CEP290 localizes to dendritic knobs of OSNs in complex with ciliary transport proteins and olfactory G proteins.\",\n      \"method\": \"Electro-olfactogram recordings, immunofluorescence, co-immunoprecipitation in rd16 mouse olfactory tissue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP, functional electrophysiology, selective localization phenotype with specific positive and negative controls\",\n      \"pmids\": [\"17898177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CC2D2A physically interacts with CEP290 at the basal body (shown by yeast two-hybrid and GST pull-down), co-localizes with CEP290 in ciliated cells, and genetically interacts with CEP290 in zebrafish: combined subminimal knockdown of CC2D2A and cep290 produces synergistic pronephric cyst phenotype.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, immunofluorescence co-localization, zebrafish morpholino epistasis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro binding (GST pull-down + Y2H) plus in vivo genetic epistasis in zebrafish\",\n      \"pmids\": [\"18950740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CEP290 localizes to the transition zone at the Y-linker region between central microtubules and plasma membrane in photoreceptor connecting cilia and other ciliated cells. Complete knockout (Cep290ko/ko) mice lack connecting cilia in retinal photoreceptors and fail to mature ciliated ventricular ependyma, demonstrating CEP290 is required for connecting cilia biogenesis.\",\n      \"method\": \"Immunofluorescence, electron microscopy, genetic KO mouse models (Cep290ko/ko and Cep290gt/gt)\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — precise ultrastructural localization combined with KO mouse phenotype; replicated across multiple mouse alleles\",\n      \"pmids\": [\"25859007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CEP290 directly binds cellular membranes through an N-terminal amphipathic helix domain and to microtubules through a domain within its myosin-tail homology region. CEP290 activity is regulated by two autoinhibitory domains at the N and C termini. Disruption of the microtubule-binding domain in a mouse model is sufficient to cause cilia formation deficits and retinal degeneration.\",\n      \"method\": \"Domain mapping, in vitro binding assays (membrane and microtubule co-sedimentation), mutagenesis, in vivo mouse model analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of binding, domain mutagenesis, and in vivo functional validation in mouse\",\n      \"pmids\": [\"24051377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BBSome physically interacts with CEP290 via BBS4 binding to the N-terminal region of CEP290. BBSome co-localizes with CEP290 at the transition zone, centriolar satellites, and connecting cilium. In BBSome-depleted cells, CEP290 still localizes to TZ and connecting cilium but its centriolar satellite localization is disrupted. Genetic interaction: additional loss of Bbs4 alleles in Cep290rd16 mice accelerates photoreceptor degeneration and increases body weight.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA depletion, Cep290rd16/Bbs4-null double-mutant mouse epistasis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP identifying specific binding domain, multiple depletion phenotypes, in vivo epistasis in mouse\",\n      \"pmids\": [\"23943788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Cep290 and Cep72 interact with PCM-1 at centriolar satellites. Cep72 is required for recruitment of Cep290 to centriolar satellites. Loss of PCM-1 satellites relocalizes Cep72 and Cep290 to the centrosome. Depletion of Cep290 or Cep72, but not loss of centriolar satellites, impairs ciliary recruitment of the BBSome subunit BBS8 during ciliogenesis, defining a Cep72-Cep290 pathway for BBSome ciliary targeting.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, zebrafish morpholino knockdown\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, selective siRNA phenotypes with hierarchy analysis, in vivo zebrafish confirmation\",\n      \"pmids\": [\"22767577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The N-terminal domain of nephrocystin-6 (CEP290/NPHP6) directly binds nephrocystin-5 (NPHP5); the interacting region maps to amino acids 696-896 of NPHP6. Combined knockdown of zNPHP5 and zNPHP6 in zebrafish produces synergistic phenotypes. Expression of the NPHP5-binding fragment of NPHP6 in Xenopus phenocopies NPHP5 knockdown neural tube closure defects, which are rescued by co-expression of NPHP5.\",\n      \"method\": \"Pull-down interaction mapping, zebrafish morpholino co-knockdown epistasis, Xenopus overexpression/rescue experiments\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro domain mapping plus two-organism in vivo genetic epistasis with rescue\",\n      \"pmids\": [\"18723859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The domain deleted in the Cep290rd16 mutant protein directly interacts with the ciliopathy protein MKKS; BBS mutations in patients disrupt this interaction. Combined subminimal knockdown of mkks and cep290 in zebrafish causes sensory defects. Paradoxically, combinations of Cep290rd16 and Mkksko alleles in mice improve ciliogenesis and sensory functions compared to either single mutant, suggesting that altered Cep290-MKKS association affects multiprotein complex integrity at the transition zone/basal body.\",\n      \"method\": \"In vitro interaction assay, zebrafish morpholino epistasis, Cep290rd16/Mkksko compound mouse mutant analysis, ciliogenesis assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein interaction, zebrafish epistasis, and mouse genetic interaction with functional rescue phenotype\",\n      \"pmids\": [\"22446187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NPHP5 contains two separate BBS-binding sites and interacts with the BBSome to mediate its integrity. Depletion of Cep290, which directly binds NPHP5, causes additional dissociation of BBS8 from the BBSome and loss of ciliary BBS8 beyond the BBS2/BBS5 loss seen with NPHP5 depletion alone. Delivery of BBSome cargos (smoothened, VPAC2, Rab8a) to cilia is selectively impaired in the absence of NPHP5 or Cep290.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliary cargo trafficking assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP defining distinct binding sites, selective BBSome dissociation phenotypes, functional cargo trafficking readout\",\n      \"pmids\": [\"25552655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NPHP5 interaction with Cep290 is required for NPHP5 function in ciliogenesis: disease-causing NPHP5 truncation mutations cannot bind Cep290 and fail to localize to centrosomes, thereby preventing cilia formation. Drugs antagonizing negative regulators of ciliogenesis rescue cilia in NPHP5-depleted cells with response profiles matching Cep290-depleted cells, further linking the two proteins to a common ciliogenic pathway.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis of patient alleles, immunofluorescence, pharmacological rescue\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — disease-mutation co-IP/localization, functional ciliogenesis rescue, mechanistic pathway placement\",\n      \"pmids\": [\"23446637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In C. elegans, CEP-290 (Cep290 ortholog) is a central MKS module assembly factor that depends on the coiled-coil region of MKS-5 (Rpgrip1L) for TZ localization. CEP-290 prevents inappropriate membrane-associated protein entry into cilia and keeps ARL-13 from leaking out through the TZ gate, defining CEP290 as essential for ciliary gating function. Multiple TZ proteins including TMEM-138 and CDKL-1 require CEP-290 for TZ localization.\",\n      \"method\": \"C. elegans genetics, GFP reporter ciliary entry/exit assays, epistasis of module localization hierarchy\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo C. elegans genetic hierarchy with functional ciliary gate assay and multiple protein localization readouts\",\n      \"pmids\": [\"26982032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In Drosophila, the N-terminus of CEP290 directly recruits DZIP1 to the transition zone; DZIP1 then recruits Chibby (CBY) and Rab8 to promote early ciliary membrane formation. Complete CEP290 deletion blocks ciliogenesis at the TZ assembly initiation stage, which is phenocopied by DZIP1 mutants lacking the CEP290-binding domain. Expression of the CEP290 N-terminus alone is sufficient to restore DZIP1 TZ localization and ameliorate TZ assembly defects.\",\n      \"method\": \"Drosophila genetics, in vitro pull-down, immunofluorescence, domain rescue experiments\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro direct binding, domain-specific rescue in vivo, mechanistic pathway ordering (CEP290→DZIP1→CBY/Rab8)\",\n      \"pmids\": [\"33370260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CEP290 loss results in enhanced DNA damage signaling and accumulation of DNA breaks in primary kidney cells and zebrafish embryos. Cep290-deficient cells exhibit supernumerary centrioles, decreased replication fork velocity, fork asymmetry, and increased CDK levels. CDK inhibition rescues both DNA damage and centriole number in Cep290-deficient cells and restores primary cilia loss in 3D kidney cell spheroids.\",\n      \"method\": \"DNA fiber assay (replication fork analysis), γH2AX immunofluorescence, centriole counting, CDK inhibitor rescue, primary murine kidney cells and zebrafish morpholino\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (fiber assay, γH2AX, CDK rescue) in single lab; nuclear function of CEP290 less independently replicated\",\n      \"pmids\": [\"26301811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CEP290 (3H11Ag) localizes to both cytoplasm and nucleus; nuclear CEP290 associates with DNA and the nuclear matrix. The C-terminal 150 amino acid residues are responsible for this subcellular localization.\",\n      \"method\": \"Fluorescent protein fusion expression in COS-7 cells, subcellular fractionation, sequential nuclear extraction, truncation mapping\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by live imaging and fractionation with domain mapping; single lab, single study\",\n      \"pmids\": [\"15474516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CEP290-mediated photoreceptor degeneration is associated with aberrant accumulation of the novel CEP290 interacting partner RKIP (Raf-1 kinase inhibitory protein) in rd16 retina. Ectopic RKIP accumulation causes defective cilia formation, an effect mediated by RKIP interaction with the ciliary GTPase Rab8A. This phenotype is reproduced by cep290 morpholino knockdown in zebrafish.\",\n      \"method\": \"Co-immunoprecipitation (CEP290-RKIP interaction), immunofluorescence in rd16 mouse retina, zebrafish morpholino knockdown, ciliogenesis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of novel interacting partner, functional cilia assay, zebrafish in vivo validation; single lab\",\n      \"pmids\": [\"21685394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Physical interaction between RPGR and the C-terminal domain of CEP290 was demonstrated. Genetically, Rpgrko/Y mice with a heterozygous hypomorphic Cep290rd16 allele (but not a null or other ciliopathy gene heterozygotes) develop early-onset retinal degeneration with disorganized outer segments and defective opsin trafficking, establishing Cep290 as a modifier of RPGR-associated retinal degeneration.\",\n      \"method\": \"Co-immunoprecipitation (RPGR–CEP290 C-terminal domain), mouse genetic epistasis (Rpgrko/Cep290rd16 compound mutants), immunofluorescence\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and in vivo genetic interaction, but specificity to the rd16 hypomorphic allele only noted in a single lab\",\n      \"pmids\": [\"26936822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SSX2IP localizes to the basal body and is required for efficient recruitment of Cep290 to centriolar satellites and the basal body. Loss of SSX2IP reduces BBSome ciliary entry and Rab8 accumulation at cilia, and decreases ciliary targeting of the membrane protein somatostatin receptor 3, placing SSX2IP upstream of Cep290 in satellite-mediated ciliary trafficking.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, ciliary trafficking assays for membrane cargo\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, knockdown phenotype with multiple cargo readouts but no direct binding assay reported\",\n      \"pmids\": [\"24356449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In JSRD fibroblasts lacking CEP290, ciliogenesis is abnormal and localization of ADCY3 and ARL13B in cilia is selectively reduced. Hedgehog signaling is augmented in CEP290-JSRD cells due to enhanced ciliary transport of Smoothened and GPR161, establishing CEP290 as a selective gatekeeper for transport of Hedgehog signaling molecules.\",\n      \"method\": \"Patient-derived fibroblasts and iPSC-optic cups, immunofluorescence, Hedgehog pathway reporter assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cell types and pathway readouts, patient-derived material, single lab\",\n      \"pmids\": [\"28700940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RPGRIP1L governs ciliary gating by ensuring the proper amount of Cep290 at the vertebrate transition zone; loss of Rpgrip1l reduces Cep290 at the TZ and impairs gating. The flavonoid eupatilin rescues ciliary gating defects caused by Rpgrip1l loss.\",\n      \"method\": \"Mouse genetics (Rpgrip1l mutants), immunofluorescence quantification of Cep290 at TZ, ciliary gating reporter assays, pharmacological rescue\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic model with TZ protein quantification and functional gating assay; single lab\",\n      \"pmids\": [\"33625872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CP110, CEP97, and CEP290 together seed the initial phosphorylated HSP27 ring at the centrosome required for aggresome assembly. Centriolar satellites are required for subsequent aggresome growth from this ring. CP110-CEP97-CEP290 are also required for aggregation of mutant huntingtin protein.\",\n      \"method\": \"siRNA/CRISPR knockdown, high-resolution microscopy (aggresome assembly assays), phospho-HSP27 immunofluorescence\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structured quantitative imaging with KD of multiple pathway components; single lab but multiple orthogonal readouts\",\n      \"pmids\": [\"35411088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A CEP290 missense variant (R1747Q/R1746Q) disrupts the ciliary diffusion barrier, causes mislocalization of the Hedgehog receptor Smoothened, and impairs Sonic Hedgehog signaling response in cerebellar granule progenitors, leading to proliferation defects. This was confirmed in an autism patient-derived iPSC line.\",\n      \"method\": \"FRAP (ciliary protein mobility), immunofluorescence (Smo localization), Shh signaling assay, patient iPSC-derived cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP for diffusion barrier, functional Shh assay, validated in patient iPSC; single lab\",\n      \"pmids\": [\"30478281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CCDC66 is a centriolar satellite protein that co-immunoprecipitates with both CEP290 and PCM1. Depletion of CCDC66 impairs ciliogenesis, ciliary BBS4 recruitment, and centriolar satellite organization.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliogenesis assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP plus KD phenotype with multiple readouts; single lab\",\n      \"pmids\": [\"28235840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Super-resolution microscopy localizes CEP290 radially between the microtubule doublets and the ciliary membrane throughout the full length of the connecting cilium in photoreceptors, with nine-fold symmetry. In contrast, in RPE-1 cells CEP290 is confined to the very base of primary cilia. Severe CEP290 deficiency does not prevent earliest cilia assembly but results in fewer cilia, no normal outer segments, and abnormal connecting cilium membrane; Y-shaped links are still present in CEP290-deficient photoreceptors.\",\n      \"method\": \"Super-resolution fluorescence microscopy (STORM/STED), electron microscopy, multiple Cep290 mutant mouse models\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — sub-diffraction resolution structural localization with multiple mutant models and EM validation\",\n      \"pmids\": [\"34520396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CEP290 is distributed throughout the connecting cilium between microtubules and membrane with nine-fold symmetry. In CEP290-deficient mouse photoreceptors, the connecting cilium membrane is aberrant, the ciliary necklace and Y-links are confined to the proximal connecting cilium, and TZ proteins AHI1 and NPHP1 are abnormally restricted to the proximal CC while NPHP8 and CEP89 are unaffected. Outer segment disc formation is inhibited and large numbers of extracellular vesicles accumulate.\",\n      \"method\": \"Electron microscopy, immunofluorescence, advanced microscopy in Cep290 conditional KO mouse photoreceptors during development\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — EM ultrastructure plus selective protein localization analysis in KO; single lab, rigorous controls\",\n      \"pmids\": [\"40704549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The Cep131-Cep162 module (near the axoneme) and the Cby-Fam92 module (close to the membrane) synergistically control the basal body localization of Cep290 and initiation of ciliogenesis in Drosophila. Concurrent deletion of any protein from both modules causes complete loss of Cep290 from the basal body and blocks ciliogenesis at its initiation stage, demonstrating cooperative retroactive interactions converging on Cep290.\",\n      \"method\": \"Drosophila genetics (single and double deletion mutants), immunofluorescence, ciliogenesis initiation assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic epistasis with double-deletion confirmation and mechanistic pathway ordering; single lab but multiple allele combinations\",\n      \"pmids\": [\"38442096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In zebrafish cep290 genetic mutants (but not morpholino knockdowns), cilia-associated small GTPases arl3, arl13b, and unc119b are upregulated; ectopic expression of these genes rescues Kupffer's vesicle cilia and partially rescues photoreceptor outer segment defects in cep290 morphants. UNC119b upregulation was also observed in human Joubert syndrome CEP290 patient-derived renal epithelial cells, identifying lipidated protein trafficking to cilia as a compensatory pathway.\",\n      \"method\": \"Zebrafish CRISPR/morpholino, RNA-seq, ectopic overexpression rescue, human patient-derived cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo functional rescue with three GTPases, confirmed in human patient cells; single lab\",\n      \"pmids\": [\"34155518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Expression of only the N-terminal region of human CEP290 rescues the vision impairment caused by cep290 disruption in zebrafish, demonstrating that the N-terminal domain is sufficient to restore visual function and represents a minimal functional unit.\",\n      \"method\": \"Zebrafish morpholino knockdown, domain-specific rescue with human CEP290 fragments, visual function assay (optokinetic response)\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain rescue in vivo with functional visual readout; single lab\",\n      \"pmids\": [\"21257638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CEP290 C-terminal domain (989 residues including the region deleted in rd16 mice) delivered by AAV complements the Cep290rd16 mutation in trans, reconstitutes CEP290 function, preserves cone photoreceptors, and delays rod death in Cep290rd16 mice and rd16;Nrl-/- mice; the same fragment also improves cilia phenotypes in mouse embryonic fibroblasts and iPSC-derived retinal organoids.\",\n      \"method\": \"AAV-mediated domain delivery, photoreceptor cell counting, ERG, cilia phenotype rescue in fibroblasts and iPSC organoids\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo functional rescue in two mouse models plus in vitro orthogonal validation; establishes C-terminal domain sufficiency\",\n      \"pmids\": [\"30332642\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CEP290 is a large multi-domain protein that localizes to the ciliary transition zone (specifically between the microtubule doublets and the membrane at Y-linker structures) and to centriolar satellites, where it acts as an essential structural and regulatory gatekeeper: its N-terminal membrane-binding amphipathic helix and microtubule-binding myosin-tail homology domain form the physical linkers tethering the ciliary membrane to TZ microtubules, while autoinhibitory N- and C-terminal domains regulate its activity; at the base of cilia CEP290 controls selective protein entry and exit (ciliary gating), interacts with RPGR, PCM-1, NPHP5, CC2D2A, MKKS, and the BBSome (via BBS4) to coordinate ciliary targeting of Rab8a and BBSome cargoes, and in photoreceptors is specifically required for connecting cilium maturation, correct spatial distribution of a subset of TZ proteins (AHI1, NPHP1), and outer segment disc formation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CEP290 is a large multi-domain ciliary protein that functions as a structural tether and selective gatekeeper at the transition zone (TZ) connecting the ciliary membrane to axonemal microtubules, controlling protein entry and exit from the cilium [#1, #14]. It directly binds membranes through an N-terminal amphipathic helix and microtubules through a domain in its myosin-tail homology region, with two autoinhibitory domains at the N and C termini regulating its activity; disruption of the microtubule-binding domain alone causes cilia deficits and retinal degeneration [#7]. In Chlamydomonas and vertebrate photoreceptors CEP290 forms the microtubule–membrane Y-linkers, localizing with nine-fold symmetry between the doublets and membrane along the connecting cilium [#1, #26]. As a gating factor it prevents inappropriate entry of membrane-associated proteins and restrains leakage of ciliary proteins such as ARL13B through the TZ [#14], and selectively controls trafficking of signaling cargoes including Hedgehog components (Smoothened, GPR161) and G proteins, with loss augmenting Hedgehog signaling [#21, #24, #4]. CEP290 also localizes to centriolar satellites in a PCM-1- and microtubule-dependent manner, where it organizes BBSome ciliary targeting and Rab8a delivery [#2, #3, #9]. It binds a network of ciliopathy proteins — NPHP5, CC2D2A, MKKS, RPGR, and the BBSome via BBS4 — to assemble and maintain TZ/satellite multiprotein complexes [#5, #8, #10, #11, #19]. CEP290 TZ localization is governed hierarchically by RPGRIP1L/MKS-5 and by cooperating basal-body modules [#14, #22, #28], and the protein is specifically required for connecting cilium biogenesis, photoreceptor outer segment disc formation, and correct spatial distribution of TZ proteins AHI1 and NPHP1 [#6, #27]. Mutations in CEP290 cause early-onset retinal degeneration, and both N-terminal and C-terminal fragments retain sufficient function to rescue ciliary and visual defects in vivo [#0, #30, #31].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established the basic subcellular distribution of CEP290 before its ciliary role was known, identifying a C-terminal determinant for nuclear/DNA-matrix association.\",\n      \"evidence\": \"Fluorescent fusion expression, subcellular fractionation, and truncation mapping in COS-7 cells\",\n      \"pmids\": [\"15474516\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of nuclear localization not defined\", \"Relationship between nuclear pool and ciliary pool unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked CEP290 to photoreceptor ciliary transport in vivo, showing that an in-frame deletion causes retinal degeneration and redistribution of RPGR and phototransduction proteins.\",\n      \"evidence\": \"Genetic mapping, co-IP, and immunogold EM in rd16 mouse retina\",\n      \"pmids\": [\"16632484\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular basis of protein mislocalization not defined\", \"Domain mediating RPGR association not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined CEP290 as a centriolar satellite component and a hub of ciliopathy-protein interactions (PCM-1, CP110, CC2D2A, NPHP5) controlling ciliogenesis and Rab8a targeting.\",\n      \"evidence\": \"Co-IP, Y2H/GST pull-down, siRNA, and zebrafish/Xenopus epistasis across multiple studies\",\n      \"pmids\": [\"18772192\", \"18694559\", \"18950740\", \"18723859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of complex assembly not resolved\", \"Whether interactions are direct vs. complex-mediated varies by partner\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved CEP290's structural function, showing it forms the microtubule–membrane linkers tethering the flagellar membrane to TZ microtubules and influences ciliary protein composition.\",\n      \"evidence\": \"Immuno-EM, biochemical fractionation, and dikaryon rescue in Chlamydomonas cep290 deletion mutant\",\n      \"pmids\": [\"20819941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the linker components beyond CEP290 unresolved\", \"Direct vs. indirect contribution to IFT protein levels unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated functional modularity, with the N-terminal region sufficient to restore vision and identifying RKIP as a partner whose accumulation impairs ciliogenesis via Rab8A.\",\n      \"evidence\": \"Zebrafish domain-rescue with human fragments and co-IP/immunofluorescence in rd16 retina\",\n      \"pmids\": [\"21257638\", \"21685394\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RKIP interaction confirmed in a single lab\", \"How N-terminal sufficiency relates to full-length gating function unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed CEP290 within satellite trafficking hierarchies (Cep72-dependent recruitment) and defined direct partners (MKKS) whose disrupted association alters TZ complex integrity.\",\n      \"evidence\": \"Co-IP, siRNA hierarchy, in vitro interaction, and zebrafish/mouse compound-mutant epistasis\",\n      \"pmids\": [\"22767577\", \"22446187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Paradoxical genetic rescue (rd16/Mkks) mechanism unresolved\", \"Stoichiometry of TZ multiprotein complexes not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapped CEP290's biochemical activities — membrane and microtubule binding plus autoinhibition — and established interdependence with NPHP5 and BBSome (via BBS4) for ciliogenesis.\",\n      \"evidence\": \"Domain mapping, in vitro co-sedimentation, mutagenesis, mouse models, co-IP, and mouse epistasis\",\n      \"pmids\": [\"24051377\", \"23446637\", \"23943788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of autoinhibition not solved\", \"Trigger relieving autoinhibition in vivo unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed CEP290 acts through NPHP5 to maintain BBSome integrity and selective ciliary cargo delivery (Smoothened, VPAC2, Rab8a).\",\n      \"evidence\": \"Co-IP defining distinct BBS-binding sites, siRNA, and ciliary cargo trafficking assays\",\n      \"pmids\": [\"25552655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CEP290 stabilizes BBSome subunit association unclear\", \"Direct vs. indirect cargo selectivity not separated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined CEP290's role in the in vivo ciliary gate (preventing aberrant entry, retaining ARL-13) and revealed a nuclear/genome-stability function linked to replication and centriole number.\",\n      \"evidence\": \"C. elegans GFP gating assays and DNA fiber/\\u03b3H2AX/CDK-rescue in primary kidney cells and zebrafish\",\n      \"pmids\": [\"26982032\", \"26301811\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear/DNA-damage function less independently replicated\", \"Mechanistic link between ciliary and replication phenotypes unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established CEP290 as a selective gatekeeper for Hedgehog signaling cargo and identified additional satellite partners and an aggresome-seeding role.\",\n      \"evidence\": \"Patient fibroblasts/iPSC-optic cups with Hedgehog reporters, co-IP, and aggresome assembly assays\",\n      \"pmids\": [\"28700940\", \"28235840\", \"35411088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CCDC66 binding interface not mapped\", \"Generality of aggresome role beyond tested cargoes unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected a specific CEP290 missense variant to a defective ciliary diffusion barrier and Hedgehog/RPGR-dependent disease modification, and demonstrated C-terminal domain sufficiency for therapeutic rescue.\",\n      \"evidence\": \"FRAP and Shh assays in patient iPSC, RPGR co-IP/mouse epistasis, and AAV C-terminal complementation in rd16 mice and organoids\",\n      \"pmids\": [\"30478281\", \"26936822\", \"30332642\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Allele-specific (rd16) nature of RPGR modification limits generalization\", \"How a single missense disrupts the barrier mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided sub-diffraction structural localization across cell types and defined upstream regulators (RPGRIP1L) and compensatory GTPase trafficking pathways.\",\n      \"evidence\": \"STORM/STED and EM in mouse photoreceptors and RPE-1, mouse Rpgrip1l genetics, and zebrafish RNA-seq/rescue with arl3/arl13b/unc119b\",\n      \"pmids\": [\"34520396\", \"33625872\", \"34155518\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why Y-links persist in CEP290-deficient photoreceptors unresolved\", \"Mechanism of eupatilin/compensatory rescue unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped the cooperative basal-body module network that recruits CEP290 to initiate ciliogenesis.\",\n      \"evidence\": \"Drosophila single and double deletion genetics with ciliogenesis-initiation assays\",\n      \"pmids\": [\"38442096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical nature of module-CEP290 contacts not defined\", \"Conservation of the dual-module logic in vertebrates untested here\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined CEP290's role in spatial organization of the connecting cilium, showing selective confinement of AHI1/NPHP1 and failure of outer segment disc formation upon loss.\",\n      \"evidence\": \"EM and selective protein localization in Cep290 conditional KO mouse photoreceptors during development\",\n      \"pmids\": [\"40704549\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism restricting AHI1/NPHP1 distribution unresolved\", \"Origin of accumulating extracellular vesicles unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CEP290's autoinhibition is relieved and how it achieves cargo-selective gating at the molecular level remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of CEP290 or its TZ linker assembly\", \"Mechanism distinguishing permitted vs. blocked cargo undefined\", \"Functional significance of nuclear CEP290 pool unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [7, 1]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 26]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 9, 12]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1, 6, 26, 27]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 2, 9]},\n      {\"term_id\": \"GO:0005813\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 6, 28]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [2, 3, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [21, 24]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 31]}\n    ],\n    \"complexes\": [\n      \"ciliary transition zone (MKS module)\",\n      \"centriolar satellites\",\n      \"CP110-CEP97-CEP290 complex\"\n    ],\n    \"partners\": [\n      \"PCM1\",\n      \"NPHP5\",\n      \"CC2D2A\",\n      \"MKKS\",\n      \"RPGR\",\n      \"BBS4\",\n      \"CP110\",\n      \"RPGRIP1L\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}